Wrench



(No Moaex.)

I'. P. SCHOPIBLD.

NITED STATES ATENT GFFiCE.

FREDERICK F. SCHOFIELI), 0F OSG/ODA, MICHIGAN.

WRENCH.

SPECIFICATION forming part of 'Letters Patent No. 455,821, dated July14, 1891.

" Application led November 28, 1 8 90.

T0 all whom, it may con/cern:

Be it known that I, FREDERICK F. SoHo- FIELD, a citizen of the UnitedStates, residing at Oscoda, county of Iosco, State of Michigan, haveinvented a certain new and useful Improvement in IVrenches; and Ideclare the following to be a full, clear, and exact description of theinvention, such as Willenable others skilled in the art to which itappertains to make and use the same, reference being had totheaccompanying drawings, which form a part of this specieation. p Myinvention has for its object certain new and usefulimprovementsin amonkey-wrench, having in view superior eflicien cy, durability,simplicity, and economy.

I carry out my invention as hereinafter specified and claimed, andillustrated in the accompanying drawings, in which- Figure l is a vie-Win perspective, and Fig. 2 is a longitudinal section.

The more especial `feature of my invent-ionY is to provide means forfacilitating the adjustment of the jaws, so that they can be quickly setas desired.

To this end A represents a xed jaw provided with a shank A., engagedwith a handle A2. B denotes a movable jaw provided with a shank B. Thejaw A and its shank A are recessed, as shown at a, to receive the shankB of the jaw B and allow its reciprocation therein. The shank B isrecessed to- Ward its rear end, as shown at b, to receive a spring baror latch C, said bar havinga serrated upper face to engage a similarserrated face on the under side of the upper wall of the recess a, asshown at a. A spring D is located under the bar C to hold said bar innormal engagement with the shank A', in which engagement it is evidentthe jaW B is held in a fixed position. A thumb-screw E has ascrew-threaded engagement with the bar C, said thumb-screw extendingthrough an elongated orifice d2 in the upper Wall of the shank A',allowing the free movement of the thumb-screw back and forth in saidoriice. The thumb-screw preferably has a milled the same.

head, as shown.

Serial No. 372,925. (No model.)

The operation of the wrench Will now be clearly understood. Theoperator, With his hand upon the handle and his thumb upon the head ofthe thumb-screw, presses downward, disengaging the spring-bar C from theserrated face of the shank A', the size of the recess b and of the barallowing for a suitable depression of the bar to permit saiddisengagement, when, it Willbe seen, a forward or backward movement ofthe thumb uponthe head of the thumb-screw Will move the jaw B to anydesired position. By releasing the thumb the spring-bar C will renew itsengagement with the-serrated face of the shank A and hold the jawB inthe position to which it has been adjusted. IE it is desired to moresecurely hold said jaw in a given position to which it may be adjusted,the thumb-screw may be turned down, drawing the bar C into firmerengagement with the serrated face of the shank A and holding it there ina very se# cure manner and preventing any accidental yielding of thespring-bar in any strain that may come upon the wrench or in handlingThe arrangement is such that the thumb-screw is in a most convenientposition, so that the wrench can be operated in a most ready andexpeditious manner.

What I ela-im as my invention isl. ln aWrench, the combination, with aiixed rocatory movement in said recess of the fixed v jaw and shank anda spring bar o r latch to engage each of said shanks and hold themovable jaw in a given position, substantially as described,

3. In aWrench, the combination, with a iixed jaw and its shank providedwith a recess, of a movable j aw and its shank having a reciprocatorymovement in said recess of the fixed jaw and shank, a spring bar orlatch to engage each of said shanks, and a thumb-screw 1o of the iXedjaw, and a thumb-screw extending through said orifice a? and having ascrewthreaded engagement with said spring bar or latch, substantially asdescribed.

In testimony whereof I sign this specification in the presence of twoWitnesses.

FREDERICK F. SCHOFIEL'D.

XVituesses:

ORIN OUTCHEON, G. H. E. HAWKINS.

